package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private DishMapper dishMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
//        判断当前加入购物车的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //获取user_id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //查出来最多只有一条数据
//        如果已经存在，则将数量加一
        if (list != null && list.size() > 0) {

            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber()+1);
            shoppingCartMapper.updateNumberById(cart);
        }else{
            //不存在则需要向数据库插入一条数据
            Long setmealId = shoppingCartDTO.getSetmealId();
            Long dishId = shoppingCartDTO.getDishId();
            if (setmealId != null) {
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());

            }else {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }


    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> list() {
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.listByUserId(userId);
        return shoppingCartList;
    }

    /**
     * 清空购物车
     */
    @Override
    public void delete() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.delete(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //根据不同的数据去查询对应的商品
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //判断当前的商品数量是否为1
        ShoppingCart cart = list.get(0);
        Integer number = cart.getNumber();
        //不是，数量减一
        if(number > 1){
            cart.setNumber(number-1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //是，删除该条数据
            shoppingCartMapper.deleteById(cart.getId());

        }

    }
}
